Re: [PATCH 4/4] intel_idle: Add SPR support with AMX INIT-state

[Thomas Gleixner]

Chang,

On Thu, Nov 04 2021 at 15:52, Chang S. Bae wrote:
> +/**
> + * intel_idle_tile - Ask the processor to enter the given idle state.
> + * @dev: cpuidle device of the target CPU.
> + * @drv: cpuidle driver (assumed to point to intel_idle_driver).
> + *
> + * Ensure TILE registers in INIT-state before using intel_idle() to
> + * enter the idle state.
> + */
> +static __cpuidle int intel_idle_tile(struct cpuidle_device *dev,
> +				     struct cpuidle_driver *drv, int index)
> +{
> +	fpu_idle_fpregs();

That's redundant because arch_cpu_idle_enter() is invoked before the
actual idle mechanism. 

> +/**
> + * intel_idle_s2idle_tile - Ask the processor to enter the given idle state.
> + * @dev: cpuidle device of the target CPU.
> + * @drv: cpuidle driver (assumed to point to intel_idle_driver).
> + * @index: Target idle state index.
> + *
> + * Ensure TILE registers in INIT-state before using intel_idle_s2idle() to
> + * enter the idle state.
> + */
> +static __cpuidle int intel_idle_s2idle_tile(struct cpuidle_device *dev,
> +					    struct cpuidle_driver *drv, int index)
> +{
> +	fpu_idle_fpregs();

Ditto

Thanks,

        tglx